Hello, we're aware of crashing during startup on Xbox, and we're investigating this as our highest priority. We've heard reports it may have something to do with the amount of Add-ons installed, which leads to a crash, so you could potentially find a workaround by only having a limited selection of content you wish to use installed until we can resolve this. Thank you for your continued patience, we're working hard on getting this fixed.
We've just posted an update regarding the Xbox crashes too if you want to read (no solution yet, but more insight on the issue) https://forums.dovetailgames.com/threads/xbox-crashes-weekend-update.74409/